If heavy neutrinos with mass mνH≥2me are produced in the Sun via the decay B8→Be8+e++νH in a side branch of the pp chain, they would undergo the observable decay into an electron, a positron and a light neutrino νH→ν L+e++e-. In the present work Borexino data are used to set a bound on the existence of such decays. We constrain the mixing of a heavy neutrino with mass 1.5 MeV≤mνH≤14 MeV to be |U eH|2≤(10-3-4×10-6), respectively. These are tighter limits on the mixing parameters than obtained in previous experiments at nuclear reactors and accelerators.
|Original language||English (US)|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Oct 29 2013|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)